JPH04341317A - Adsorption tower using fibrous activated carbon - Google Patents

Abstract

PURPOSE:To desorb adsorbed materials without passing a regenerating gas such as steam through an adsorbent in desorption. CONSTITUTION:A gas passage is composed of a round bar installed in an adsorption tower 1 paralleling the center axis of the tower at a distance from the axis and a middle cylindrical part partitioned by a wire gauze supported by the round bar. A pipe 12 for heating a wound fibrous activated carbon 11 is fixed between the wire gauze and an outer casing 8 keeping a given distance. When the adsorption tower is used for the recovery of gaseous harmful materials such as a solvent, since the fibrous activated carbon is not directly contacted with steam, the recovery can be performed efficiently with reduced decomposition.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorption tower using fibrous activated carbon, and more particularly to an adsorption tower employing an indirect heating method using fibrous activated carbon.

0002

2. Description of the Related Art Conventionally, gaseous harmful substances released into the atmosphere have been on the decline due to the development of various pollution control devices. Generally, gaseous harmful substances that are relatively difficult to treat (such as solvents) are treated by adsorption using activated carbon.

However, this activated carbon adsorption treatment method cannot be said to be an economically effective method when treating gas components with a small adsorption amount or low boiling point gas components with a boiling point of 10° C. or less.

In this conventional method, as shown in FIG.
With 08 and 109 open, the gas to be treated containing gaseous harmful substances passes through the conduit 101 and enters the adsorption tower 115 filled with activated carbon 116, where the gaseous harmful substance components in the gas to be processed are removed. The adsorbed clean air is discharged via conduit 102. On the other hand, when the activated carbon becomes saturated with harmful substances, dampers 108 and 109 are closed and valves 110 and 111 are opened to supply steam to the activated carbon adsorption tower through conduit 103 for regeneration. This steel
The activated carbon is heated by the steam supply, and the adsorbed harmful substance components are desorbed and discharged together with the steam through the conduit 104.

The discharged gaseous hazardous substances and steam are cooled and condensed in a condenser 112, and introduced into a separator 113 through a conduit 105, where they are separated into liquid hazardous substance components and condensed water. The components are collected through conduit 107 into collection container 114 . On the other hand, the condensed water is discharged from the system through the conduit 106.

[0006] As described above, in the conventional method, when processing a gas containing gaseous harmful substances with a boiling point of 10°C or less,
It was necessary to keep the temperature in the condenser 112 below the boiling point of the harmful substances.

[0007] As a method for solving the drawbacks of such conventional methods, for example, there is a method described in Japanese Patent Publication No. 2-30728.

That is, a method for adsorbing exhaust gas containing gaseous harmful substances includes (1) an adsorption step of bringing the exhaust gas into contact with an adsorbent to adsorb the gaseous harmful substances contained in the exhaust gas; A desorption step in which the adsorbent that has adsorbed the harmful substance is heated with steam to generate a gaseous mixture containing the gaseous harmful substance and steam; (3) the gaseous mixture from the desorption step is not allowed to drop below freezing point; a steam condensation step in which only steam is condensed by cooling at a temperature; (4) a first gas-liquid separation step in which condensed water and gaseous harmful substances produced in the steam condensation step are separated; ) a storage step for storing the separated gaseous harmful substances; (6) a suction compression step for suctioning and compressing the gaseous harmful substances stored in the storage step and partially condensing them; a cooling step of cooling the gas-liquid mixture of harmful substances; (8) a second gas-liquid separation step of separating the gas-liquid mixture of harmful substances from the cooling step; (10) A gaseous harmful substance circulation step of circulating the gaseous harmful substance from the second gas-liquid separation step to the first gas-liquid separation step (4). That is.

However, in this method, the activated carbon used in the adsorption tower adsorbs gaseous harmful substances, and when the harmful substances are adsorbed and the harmful substances are desorbed from the activated carbon, (1) a large amount of steam is generated. (2) If the recovered solvent is an easily decomposable solvent, it will decompose and a large amount of waste water will be produced.

0010

SUMMARY OF THE INVENTION The present invention aims to solve the above problems, and specifically uses fibrous activated carbon attached to a pipe as an adsorbent, which has high adsorption energy efficiency. The purpose of the present invention is to propose an adsorption tower in which the speed of adsorption and desorption is improved without bringing steam into direct contact with fibrous activated carbon during desorption, and the quality of the recovered solvent is also good.

[0011]

[Means for Solving the Problems] That is, the present invention provides an adsorption tower in which exhaust gas containing gaseous harmful substances is adsorbed by fibrous activated carbon. The invention is characterized by comprising: a round bar provided on the base, a wire mesh supported by the round bar, and a pipe wrapped with the fibrous activated carbon at a predetermined distance between the wire mesh and the mantle. .

0012

[Operation] The present invention will be explained below with reference to the drawings.

FIGS. 1(a) and 1(b) show an adsorption tower showing one embodiment of the present invention, in which (a) is a longitudinal cross-sectional view, and (b) is a cross-sectional view taken along the line A--A in (a). FIG. 2 shows a system diagram of a conventional device. Code 1 is the adsorption tower, 2 is the upper cover, 3
is the bottom cover, 4 is the gas inlet, 5 is the gas outlet, 6 is the steam inlet, 7 is the steam outlet, 8 is the jacket, 9 is the round bar, 10 is the wire mesh, 11 is the fibrous activated carbon, 12 is the pipe shows.

First, as shown in FIGS. 1(a) and 1(b), inside the jacket 8 of the adsorption tower 1 of the present invention, there is provided a pipe around which a round bar 9, a wire mesh 10, and fibrous activated carbon 11 are wound. By heating this pipe 12, indirect heating is possible. The adsorption tower 1 is provided with a gas inlet 4 at the bottom, a gas outlet 5 at the top, and a desorption steam inlet 6 and a steam outlet 7 at the top.

The gas to be treated is supplied from the gas inlet 4 under reduced pressure or increased pressure to the adsorption tower 1 constructed as described above, and adsorption is completed.

Next, the pipe 12 is heated to remove the gaseous harmful substances adsorbed on the fibrous activated carbon 11 through the air inlet 6.
All you have to do is supply air from there and collect it.

[0017]

[Example] Using the apparatus shown in Figures 1(a) and (b), gaseous harmful substances were treated under the conditions shown below.
Good results were obtained as shown below. Conditions (1) Solvent: 1.1.1. Trichloroethane (
2) Gas concentration: 2000-3000 ppm (3) Desorption temperature: 110°C (4) Vacuum degree: 50-150 Torr Results (1) Recovery capacity: 0.23-0.30 Kg/AC. kg
．． Hr (2) Drainage volume/Recovered solvent volume: 1/10 to 1/5 (3) Solvent quality: pH 6.0 to 6.5 Stabilizer residual rate 90 to 95%

[0018]

As explained in detail above, the present invention provides an adsorption tower in which waste gas containing gaseous harmful substances is adsorbed by fibrous activated carbon. The present invention is characterized by comprising: a round bar provided as shown in FIG. do.

According to the present invention, a pipe wrapped with fibrous activated carbon is used as the activated carbon for adsorption, and gaseous harmful substances are adsorbed and heated by indirect heating during desorption, resulting in high energy efficiency. - Since the membrane is not brought into direct contact with the fibrous activated carbon, there is little decomposition of gaseous harmful substances, and high-quality substances can be efficiently recovered.

[Brief explanation of drawings]

[Fig. 1] (a) and (b) are adsorption towers showing one embodiment of the present invention, (a) is a longitudinal cross-sectional view, and (b)
is a sectional view taken along line A-A in (a).

FIG. 2 is a system diagram of a conventional device.

[Explanation of symbols]

1 Adsorption tower 2 Top lid 3 Bottom lid 4 Gas inlet 5 Gas outlet 6 Steam inlet 7 Steam outlet 8 Cloak 9 Round bar 10 Wire mesh 11 Fibrous activated carbon 12 Pipe

Claims (1)

[Claims] 1. An adsorption tower that adsorbs exhaust gas containing gaseous harmful substances using fibrous activated carbon, in which a round bar is provided in the adsorption tower parallel to the central axis and at a predetermined interval; 1. An adsorption tower using fibrous activated carbon, characterized in that a wire mesh supported by a rod and a pipe around which the fibrous activated carbon is wound are provided at a predetermined distance between the wire mesh and the mantle.